Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
|
|
Thread Tools | Search this Thread | Display Modes |
16th July 2021, 20:52 | #21 | Link | |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
|
Quote:
One of the two x265 encodes is default --tune grain (with a couple of modifications such as deblock -3/-3, but nothing major) and the other is Ben Waggoner's suggestion higher up the thread. Last edited by tonemapped; 16th July 2021 at 21:12. |
|
17th July 2021, 02:27 | #22 | Link | |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
|
Quote:
For just over four hours of encoding time for four minutes of video, the results were not as good as hoped. The video seems to 'smear' grain into other grain. |
|
17th July 2021, 10:08 | #23 | Link |
Pig on the wing
Join Date: Mar 2002
Location: Finland
Posts: 5,803
|
The difference between x264 and x265 is that the former creates blocking and the latter blurs when it's bitrate-starved and usually blocking doesn't seem as distracting. The QPs look quite high so the encode definitely is lacking bits. The encoding process is definitely very slow, so probably you're better off with x264 anyway.
__________________
And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon... |
17th July 2021, 17:50 | #24 | Link | |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
|
Quote:
x265 is meant to bring improvements in size:compression/efficiency, amongst other features, and it's mature enough by now that grain retention should match that of x264's. x265 seems good for content with very, very light grain and content without grain. This is the most bizarre part to me. Even the --grain preset produces poor results. Again, the entire point of doing a 2-pass encode at 5mbps is to compare different codecs and encoding methods at the same bitrate using the same source. If the newest one loses to hardware encoding and its predecessor, that shows a problem. I do use crf for encoding the vast majority of content for storage, but that's not the point of this test. Last edited by tonemapped; 17th July 2021 at 18:01. |
|
17th July 2021, 20:51 | #25 | Link |
Pig on the wing
Join Date: Mar 2002
Location: Finland
Posts: 5,803
|
Unfortunately x265 is not tuned for grain retention. We have fought that issue for years but the devs have never considered it a high priority thing. The tunings are not revised at all, and the first three AQ modes were mostly just ported directly from x264 and then left as they are.
The biggest issue with x265 is is that the most capable people left a long time ago and even patch validation has had issues with features getting worse with development.
__________________
And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon... |
17th July 2021, 22:36 | #26 | Link | |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
|
Quote:
For example, I recently encoded a few episodes of Charmed from Blu-ray using CRF 21 with only a few changes (no-sao, etc.) and the result is great and only ~1.2GB per episode instead of ~7GB. A little bit of quality is lost in dark areas, but that's less of a concern for me. Overall, I would say it's 90% of the quality for 1/7 of the size. x264 would have severely struggled to output a reasonable file with the same bitrate/CRF constraints, so there's definitely a use for it. |
|
18th July 2021, 19:40 | #27 | Link |
Pig on the wing
Join Date: Mar 2002
Location: Finland
Posts: 5,803
|
I still wouldn't call that grain, it's much more like quantization noise to me. That is more difficult to encode in a nice way than true film grain as it gets ugly quite easily like you have proven here.
__________________
And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon... |
23rd July 2021, 22:30 | #29 | Link |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
|
Not entirely sure. There was a message about b-frames not being supported on 'Gen 9.5' hardware (UHD 605, API 1.3x). On NVENC, I have no idea why b-frames weren't used. Either way, NVENC still produced some of the worst with over 20 tests of the same clip, compared to even QSV.
|
Tags |
grain, noise, nvenc, qsv, x265 |
Thread Tools | Search this Thread |
Display Modes | |
|
|